2008 US Electoral Map Prediction

Chris F. Masse June 11th, 2008

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US ELECTORAL MAP: Prediction Markets for the 2008 Electoral College

ElectoralMarkets.com

Via Read & Write Web

2008 Electoral Map (based on InTade) + 2008 Electoral Map (based on polls)

UPDATE: Hal Finney

See our PREDICTIONS page for more predictive data…

Probabilistic predictions for the 2008 US presidential elections based on market data from InTrade Ireland —(electoralmarkets.com).

By Lance Fortnow, David Pennock, and Yiling Chen.

#1. Explainer On Prediction Markets

A prediction market is a market for a contract that yields payments based on the outcome of a partially uncertain future event, such as an election. A contract pays $100 only if candidate X wins the election, and $0 otherwise. When the market price of an X contract is $60, the prediction market believes that candidate X has a 60% chance of winning the election. The price of this event derivative represents the imputed perceived likelihood of this partially uncertain event (i.e., its aggregated expected probability). A 60% probability means that, in a series of events each with a 60% probability, the favored outcome is expected to occur 60 times out of 100, and the unfavored outcome is expected to occur 40 times out of 100.

Each prediction exchange organizes its own set of real-money and/or play-money markets, using either a CDA or a MSR mechanism —with or without an automated market maker.

Prediction markets enable us to attain collective intelligence. Prediction markets produce dynamic, objective probabilistic predictions on the outcomes of future events by aggregating disparate pieces of information that the traders bring when they agree on prices. The event derivative traders are informed by the primary indicators (i.e., the primary sources of information), like the polls, for instance. These informed speculators then execute their transactions based on their anticipations about the future —anticipations that will be either confirmed or infirmed.

The value of a set of prediction markets consists in the added accuracy that these prediction markets provide relative to the other forecasting mechanisms, times the value of accuracy in improved decisions, minus the cost of maintaining these prediction markets, relative to the cost of the other forecasting mechanisms. According to Robin Hanson, a highly accurate prediction market has little value if some other forecasting mechanism(s) can provide similar accuracy at a lower cost, or if very few substantial decisions are influenced by accurate forecasts on its topic.

More Info:

- The Best Resources On Prediction Markets = The Best External Web Links + The Best Midas Oracle Posts

- Prediction Market Science

- The Midas Oracle Explainers On Prediction Markets

- All The Midas Oracle Explainers On Prediction Markets

#2. Probabilistic Predictions = Charts Of Prediction Markets

Put your mouse on your selected chart, right-click, and open the link in another browser tab to get directed to the prediction market page of your favorite exchange.

InTrade

2008 US Electoral College

2008 Electoral Map Prediction = InTrade - Electoral College Prediction Markets = Probabilistic predictions for the 2008 US presidential elections based on market data from InTrade Ireland = electoralmarkets.com

- This is a dynamic chart, which is up to date. Click on the image, and open the website in another browser tab to get the bigger version.

- This is a static chart, which is not up to date. Right-click on the image, and open the website in another browser tab to get the updated version.